BStyles - from another board - the reason the crane in the SW corner doesn't appear to move is that the steel over the tracks is being placed from midnight to 4 AM with the tracks de-energized. The diagonal beam that I thought had been placed during the morning actually was placed that previous night, in re-looking at the first picture I used to make the comparison observation, the beam was already there, it was just hard to see in the shadow.
http://rebuildgroundzero.org/webcam/rgz_000.jpg
Is back up just in time, seeing that Earthcam is pointing to a roof puddle, and "looking north" is a blue screen.